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Finality loop: get block justification and authorities change by consensus engine ID (#1619)

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* SignedBlock: get justification by consensus engine id

* Define ConsensusLogReader

Making the check for authority changes more generic

* cod review changes
This commit is contained in:
Serban Iorga
2022-10-28 13:12:37 +03:00
committed by Bastian Köcher
parent f58e076ca2
commit 01538bc5fa
9 changed files with 90 additions and 66 deletions
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bridges/primitives/header-chain/src/lib.rs
+28 -15
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@@ -26,7 +26,7 @@ use scale_info::TypeInfo;
#[cfg(feature = "std")]
use serde::{Deserialize, Serialize};
use sp_finality_grandpa::{AuthorityList, ConsensusLog, SetId, GRANDPA_ENGINE_ID};
use sp_runtime::{generic::OpaqueDigestItemId, traits::Header as HeaderT, RuntimeDebug};
use sp_runtime::{traits::Header as HeaderT, Digest, RuntimeDebug};
use sp_std::boxed::Box;
pub mod justification;
@@ -77,18 +77,31 @@ pub trait FinalityProof<Number>: Clone + Send + Sync + Debug {
fn target_header_number(&self) -> Number;
}
/// Find header digest that schedules next GRANDPA authorities set.
pub fn find_grandpa_authorities_scheduled_change<H: HeaderT>(
header: &H,
) -> Option<sp_finality_grandpa::ScheduledChange<H::Number>> {
let id = OpaqueDigestItemId::Consensus(&GRANDPA_ENGINE_ID);
let filter_log = |log: ConsensusLog<H::Number>| match log {
ConsensusLog::ScheduledChange(change) => Some(change),
_ => None,
};
// find the first consensus digest with the right ID which converts to
// the right kind of consensus log.
header.digest().convert_first(|l| l.try_to(id).and_then(filter_log))
/// A trait that provides helper methods for querying the consensus log.
pub trait ConsensusLogReader {
fn schedules_authorities_change(digest: &Digest) -> bool;
}
/// A struct that provides helper methods for querying the GRANDPA consensus log.
pub struct GrandpaConsensusLogReader<Number>(sp_std::marker::PhantomData<Number>);
impl<Number: Codec> GrandpaConsensusLogReader<Number> {
pub fn find_authorities_change(
digest: &Digest,
) -> Option<sp_finality_grandpa::ScheduledChange<Number>> {
// find the first consensus digest with the right ID which converts to
// the right kind of consensus log.
digest
.convert_first(|log| log.consensus_try_to(&GRANDPA_ENGINE_ID))
.and_then(|log| match log {
ConsensusLog::ScheduledChange(change) => Some(change),
_ => None,
})
}
}
impl<Number: Codec> ConsensusLogReader for GrandpaConsensusLogReader<Number> {
fn schedules_authorities_change(digest: &Digest) -> bool {
GrandpaConsensusLogReader::<Number>::find_authorities_change(digest).is_some()
}
}